Windows 11 slows down Ryzen processors. Performance reduction up to 15%

After launching Windows 11, quite a few people decided to install a new system right away, without waiting for the first information about any serious errors. There were also many users of AMD Ryzen processors among them, and unfortunately, in their case, this was not a good idea. It turns out that a significant error has been detected, leading to a significant decrease in performance, capable of reaching up to 15%. It looks like the CPPC2 function is not working properly.

AMD and Microsoft have reported the recognition of errors affecting the performance of chips in applications. The first one concerns the management of the L3 processor cache memory-the access time has been tripled. This leads to the fact that programs that heavily load the memory subsystem may work less efficiently than before. According to the declaration, in most cases we are talking about a decrease in productivity by 3-5%, but it is possible to reduce it even by 10-15%, primarily in esports games.

An error was also found in the operation of the CPPC2 function (also called “preferred core”), which may not schedule the use of preferred threads for the fastest processor core. This, in turn, leads to a decrease in performance in applications based on the performance of a single core. AMD mentions that the differences are mostly visible for chips with at least eight cores whose TDP exceeds 65 watts.

From the users’ point of view, the most important thing is that fixes are on the way. AMD and Microsoft announced the release of the patch back in October 2021. It’s worth noting that, although the system itself works pretty well, if you use the top ten and are happy with it, a quick upgrade to Windows 11 may not make sense.